Abstract
In order to investigate whether an end-of-day (EOD) addition of a single light quality could help alleviate high-light stress in a cucumber, cucumber seedlings were subjected to a 9 d period of high-light stress (light intensity was 1300 ± 50 μmol·m−2·s−1) when they were growing to 3 leaves and 1 heart, while the red light (R), blue light (B), green light (G), far-red light (FR), and ultraviolet A (UVA) light were added in the end-of-day period. The present study was conducted to measure antioxidants, chlorophyll content, and its synthetic degradative enzymes and chlorophyll a fluorescence in response to the degree of stress in cucumber seedlings. The experimental results demonstrated that the addition of blue light, UVA light, and green light significantly decreased the SOD and POD activities in the middle of the treatment (6th day) compared to the dark (D) treatment and improved the absorption performance of the PSI reaction centre of the cucumber seedling leaves to a certain extent (PIABS), but the PSII capacity capture ability (TRo/RC) of the three treatments decreased compared to the D treatment. The MDA content of all the treatments had a significant decrease compared to that of the D treatment. The MDA content of all the treatments was significantly lower than that of D, and its FV/FM was increased to different degrees; the chlorophyll degrading enzyme PPH activity was significantly lower than that of the D treatment when a single light quality was added at the EOD period on the 9th d of treatment. In conclusion, cucumber seedlings subjected to short-term high-light stress can be added during the EOD period with a low-light intensity of a single R, G, B, or UVA light.
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Claims 16
Claim · model-written summary
Blue light decreased SOD and POD activities on day 6 relative to dark treatment.
- Taxon
- Cucumber
Cucumis sativuse0t0 - Treatment
- blue lighte0
- Outcome
- SOD and POD activitiese0
- Direction
- decreasede0
- Qualifier
- 6th daye0
- Comparator
- dark (D) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of blue light, UVA light, and green light significantly decreased the SOD and POD activities in the middle of the treatment (6th day) compared to the dark (D) treatment”
t0“Cucumber Seedlings”
Claim · model-written summary
UVA light decreased SOD and POD activities on day 6 relative to dark treatment.
- Taxon
- CucumberCucumis sativuse0t0
- Treatment
- UVA lighte0
- Outcome
- SOD and POD activitiese0
- Direction
- decreasede0
- Qualifier
- 6th daye0
- Comparator
- dark (D) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of blue light, UVA light, and green light significantly decreased the SOD and POD activities in the middle of the treatment (6th day) compared to the dark (D) treatment”
t0“Cucumber Seedlings”
Claim · model-written summary
Green light decreased SOD and POD activities on day 6 relative to dark treatment.
- Taxon
- CucumberCucumis sativuse0t0
- Treatment
- green lighte0
- Outcome
- SOD and POD activitiese0
- Direction
- decreasede0
- Qualifier
- 6th daye0
- Comparator
- dark (D) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of blue light, UVA light, and green light significantly decreased the SOD and POD activities in the middle of the treatment (6th day) compared to the dark (D) treatment”
t0“Cucumber Seedlings”
Claim · model-written summary
Blue light improved PSI reaction-centre absorption performance.
- Taxon
- CucumberCucumis sativuse0
- Treatment
- blue lighte1
- Outcome
- absorption performance of the PSI reaction centree0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved the absorption performance of the PSI reaction centre of the cucumber seedling leaves to a certain extent (PIABS)”
e1“the addition of blue light, UVA light, and green light”
t0“Cucumber Seedlings”
Claim · model-written summary
UVA light improved PSI reaction-centre absorption performance.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UVA lighte1
- Outcome
- absorption performance of the PSI reaction centree0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved the absorption performance of the PSI reaction centre of the cucumber seedling leaves to a certain extent (PIABS)”
e1“the addition of blue light, UVA light, and green light”
Claim · model-written summary
Green light improved PSI reaction-centre absorption performance.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- green lighte1
- Outcome
- absorption performance of the PSI reaction centree0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved the absorption performance of the PSI reaction centre of the cucumber seedling leaves to a certain extent (PIABS)”
e1“the addition of blue light, UVA light, and green light”
Claim · model-written summary
Blue light decreased PSII capture capacity relative to dark treatment.
- Taxon
- CucumberCucumis sativust0
- Treatment
- blue lighte1
- Outcome
- PSII capacity capture abilitye0
- Direction
- decreasede0
- Comparator
- D treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the PSII capacity capture ability (TRo/RC) of the three treatments decreased compared to the D treatment”
e1“the addition of blue light, UVA light, and green light”
t0“Cucumber Seedlings”
Claim · model-written summary
UVA light decreased PSII capture capacity relative to dark treatment.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UVA lighte1
- Outcome
- PSII capacity capture abilitye0
- Direction
- decreasede0
- Comparator
- D treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the PSII capacity capture ability (TRo/RC) of the three treatments decreased compared to the D treatment”
e1“the addition of blue light, UVA light, and green light”
t0“Cucumber Seedlings”
Claim · model-written summary
Green light decreased PSII capture capacity relative to dark treatment.
- Taxon
- CucumberCucumis sativust0
- Treatment
- green lighte1
- Outcome
- PSII capacity capture abilitye0
- Direction
- decreasede0
- Comparator
- D treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the PSII capacity capture ability (TRo/RC) of the three treatments decreased compared to the D treatment”
e1“the addition of blue light, UVA light, and green light”
t0“Cucumber Seedlings”
Claim · model-written summary
All supplemental light treatments significantly decreased MDA content relative to dark treatment.
- Taxon
- CucumberCucumis sativuse0t0
- Treatment
- all the treatmentse0
- Outcome
- MDA contente0
- Direction
- decreasee0
- Comparator
- D treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MDA content of all the treatments had a significant decrease compared to that of the D treatment.”
t0“Cucumber Seedlings”
Claim · model-written summary
All supplemental light treatments increased FV/FM to varying degrees.
- Taxon
- CucumberCucumis sativuse0t0
- Treatment
- all the treatmentse0
- Outcome
- FV/FMe0
- Direction
- increasede0
- Comparator
- De0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MDA content of all the treatments was significantly lower than that of D, and its FV/FM was increased to different degrees”
t0“Cucumber Seedlings”
Claim · model-written summary
End-of-day single light quality significantly lowered PPH activity by day 9 relative to dark treatment.
- Taxon
- CucumberCucumis sativuse0t0
- Treatment
- a single light qualitye0
- Outcome
- chlorophyll degrading enzyme PPH activitye0
- Direction
- lowere0
- Qualifier
- 9th d of treatmente0
- Comparator
- D treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chlorophyll degrading enzyme PPH activity was significantly lower than that of the D treatment when a single light quality was added at the EOD period on the 9th d of treatment”
t0“Cucumber Seedlings”
Claim · model-written summary
Authors recommend low-intensity end-of-day R light for cucumber seedlings under short-term high light stress.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Re0
- Outcome
- low-light intensity of a single Re0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings subjected to short-term high-light stress can be added during the EOD period with a low-light intensity of a single R, G, B, or UVA light.”
Claim · model-written summary
Authors recommend low-intensity end-of-day G light for cucumber seedlings under short-term high light stress.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Ge0
- Outcome
- Ge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings subjected to short-term high-light stress can be added during the EOD period with a low-light intensity of a single R, G, B, or UVA light.”
Claim · model-written summary
Authors recommend low-intensity end-of-day B light for cucumber seedlings under short-term high light stress.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Be0
- Outcome
- Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings subjected to short-term high-light stress can be added during the EOD period with a low-light intensity of a single R, G, B, or UVA light.”
Claim · model-written summary
Authors recommend low-intensity end-of-day UVA light for cucumber seedlings under short-term high light stress.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- UVA lighte0
- Outcome
- UVA lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings subjected to short-term high-light stress can be added during the EOD period with a low-light intensity of a single R, G, B, or UVA light.”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.